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-rw-r--r--keyboards/ploopyco/opt_encoder.c211
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diff --git a/keyboards/ploopyco/opt_encoder.c b/keyboards/ploopyco/opt_encoder.c
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+/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
+ * Copyright 2020 Ploopy Corporation
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include "opt_encoder.h"
+
+/* Setup function for the scroll wheel. Initializes
+ the relevant variables. */
+void opt_encoder_init(void) {
+ state = HIHI;
+ lohif = false;
+ hilof = false;
+ lowA = 1023;
+ highA = 0;
+ cLowA = false;
+ cHighA = false;
+ lowIndexA = 0;
+ highIndexA = 0;
+ lowOverflowA = false;
+ highOverflowA = false;
+ lowB = 1023;
+ highB = 0;
+ cLowB = false;
+ cHighB = false;
+ lowIndexB = 0;
+ highIndexB = 0;
+ lowOverflowB = false;
+ highOverflowB = false;
+ scrollThresholdA = 0;
+ scrollThresholdB = 0;
+}
+
+int opt_encoder_handler(int curA, int curB) {
+ if (lowOverflowA == false || highOverflowA == false) calculateThresholdA(curA);
+ if (lowOverflowB == false || highOverflowB == false) calculateThresholdB(curB);
+
+ bool LO = false;
+ bool HI = true;
+ bool sA, sB;
+ int ret = 0;
+
+ if (curA < scrollThresholdA)
+ sA = LO;
+ else
+ sA = HI;
+
+ if (curB < scrollThresholdB)
+ sB = LO;
+ else
+ sB = HI;
+
+ if (state == HIHI) {
+ if (sA == LO && sB == HI) {
+ state = LOHI;
+ if (hilof) {
+ ret = 1;
+ hilof = false;
+ }
+ } else if (sA == HI && sB == LO) {
+ state = HILO;
+ if (lohif) {
+ ret = -1;
+ lohif = false;
+ }
+ }
+ }
+
+ else if (state == HILO) {
+ if (sA == HI && sB == HI) {
+ state = HIHI;
+ hilof = true;
+ lohif = false;
+ } else if (sA == LO && sB == LO) {
+ state = LOLO;
+ hilof = true;
+ lohif = false;
+ }
+ }
+
+ else if (state == LOLO) {
+ if (sA == HI && sB == LO) {
+ state = HILO;
+ if (lohif) {
+ ret = 1;
+ lohif = false;
+ }
+ } else if (sA == LO && sB == HI) {
+ state = LOHI;
+ if (hilof) {
+ ret = -1;
+ hilof = false;
+ }
+ }
+ }
+
+ else { // state must be LOHI
+ if (sA == HI && sB == HI) {
+ state = HIHI;
+ lohif = true;
+ hilof = false;
+ } else if (sA == LO && sB == LO) {
+ state = LOLO;
+ lohif = true;
+ hilof = false;
+ }
+ }
+
+ return ret;
+}
+
+void calculateThresholdA(int curA) { scrollThresholdA = calculateThreshold(curA, &lowA, &highA, &cLowA, &cHighA, arLowA, arHighA, &lowIndexA, &highIndexA, &lowOverflowA, &highOverflowA); }
+
+void calculateThresholdB(int curB) { scrollThresholdB = calculateThreshold(curB, &lowB, &highB, &cLowB, &cHighB, arLowB, arHighB, &lowIndexB, &highIndexB, &lowOverflowB, &highOverflowB); }
+
+int calculateThreshold(int cur, int* low, int* high, bool* cLow, bool* cHigh, int arLow[], int arHigh[], int* lowIndex, int* highIndex, bool* lowOverflow, bool* highOverflow) {
+ if (cur < *low) *low = cur;
+ if (cur > *high) *high = cur;
+
+ int curThresh = thresholdEquation(*low, *high);
+ int range = *high - *low;
+
+ // The range is enforced to be over a certain limit because noise
+ // can cause erroneous readings, making these calculations unstable.
+ if (range >= SCROLL_THRESH_RANGE_LIM) {
+ if (cur < curThresh) {
+ if (*cHigh == true) {
+ // We were just high, and now we crossed to low.
+ // high reflects a sample of a high reading.
+ arHigh[*highIndex] = *high;
+ incrementIndex(highIndex, highOverflow);
+ int midpoint = ((*high - *low) / 2) + *low;
+ *low = midpoint;
+ *high = midpoint;
+ *cLow = false;
+ *cHigh = false;
+ } else {
+ *cLow = true;
+ }
+ }
+ if (cur > curThresh) {
+ if (*cLow == true) {
+ // We were just low, and now we crossed to high.
+ // low reflects a sample of a low reading.
+ arLow[*lowIndex] = *low;
+ incrementIndex(lowIndex, lowOverflow);
+ int midpoint = ((*high - *low) / 2) + *low;
+ *low = midpoint;
+ *high = midpoint;
+ *cLow = false;
+ *cHigh = false;
+ } else {
+ *cHigh = true;
+ }
+ }
+ }
+
+ int calcHigh = 0;
+ if (*highOverflow == true) {
+ for (int i = 0; i < SCROLLER_AR_SIZE; i++) {
+ calcHigh += arHigh[i];
+ }
+ calcHigh = calcHigh / SCROLLER_AR_SIZE;
+ } else if (*highIndex != 0) {
+ for (int i = 0; i < *highIndex; i++) {
+ calcHigh += arHigh[i];
+ }
+ calcHigh = calcHigh / *highIndex;
+ } else {
+ calcHigh = *high;
+ }
+
+ int calcLow = 0;
+ if (*lowOverflow == true) {
+ for (int i = 0; i < SCROLLER_AR_SIZE; i++) {
+ calcLow += arLow[i];
+ }
+ calcLow = calcLow / SCROLLER_AR_SIZE;
+ } else if (*lowIndex != 0) {
+ for (int i = 0; i < *lowIndex; i++) {
+ calcLow += arLow[i];
+ }
+ calcLow = calcLow / *lowIndex;
+ } else {
+ calcLow = *low;
+ }
+
+ return thresholdEquation(calcLow, calcHigh);
+}
+
+int thresholdEquation(int lo, int hi) { return ((hi - lo) / 3) + lo; }
+
+void incrementIndex(int* index, bool* ovflw) {
+ if (*index < SCROLLER_AR_SIZE - 1)
+ (*index)++;
+ else {
+ *index = 0;
+ *ovflw = true;
+ }
+}